... ) 3 digit bright LED timer relay 2) Thumb switch setting 3) Power fail memory timer ... 9H digital Timer RelayHM4 model digital Timer RlayHM series Timer Relay has timing function with 3 digit LED display, and ... minute, second), output mode selection (3 modes), output maintain time setting, key lock function, etc.4) By selecting different output ... HM4: 220VAC, HM6 / 7: 110 / 220VAC. HM4 Digital Timer Relay